Journal
ANALYTICAL CHEMISTRY
Volume 94, Issue 49, Pages 17263-17271Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c04218
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Funding
- National Natural Science Foundation of China [82073811, 82273895, 81673394]
- Fundamental Research Funds for the Central Universities [2042020kf1010]
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A dual-mode assay method combining fluorescence and photothermal was developed to detect AChE activity. Utilizing metal-organic frameworks and o-phenylenediamine cascade polymers, the method accurately measures AChE activity in human serum.
A fluorescent and photothermal dual-mode assay method was established for the detection of acetylcholinesterase (AChE) activity based on in situ formation of o-phenylenediamine (oPD) cascade polymers. First, copper metal-organic frameworks of benzenetricarboxylic acid (Cu-BTC) were screened out as nanozymes with excellent oxidase-like activity and confinement catalysis effect. Then, an ingenious oPD cascade polymerization strategy was proposed. That is, oPD was oxidized by Cu-BTC to oPD oligomers with strong yellow fluorescence, and oPD oligomers were further catalyzed to generate J-aggregation, which promotes the formation of oPD polymer nanoparticles with a high photothermal effect. By utilizing thiocholine (enzymolysis product of acetylthiocholine) to inhibit the Cu-BTC catalytic effect, AChE activity was detected through the fluorescence-photothermal dual-signal change of oPD oligomers and polymer nanoparticles. Both assay modes have low detection limitation (0.03 U L-1 for fluorescence and 0.05 U L-1 for photothermal) and can accurately detect the AChE activity of human serum (recovery 85.0-111.3%). The detection results of real serum samples by fluorescent and photothermal dual modes are consistent with each other (relative error <= 5.2%). It is worth emphasizing that this is the first time to report the high photothermal effect of oPD polymers and the fluorescence-photothermal dual-mode assay of enzyme activity.
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